Here is a quick, awesome utility application aptly named ReverseLookup. Reverse lookup is always a great feature to have for those times when you get random or unknown numbers calling you. Some applications such as Poynt have it built in, but Poynt is a larger download then this application. ReverseLookup adds a little more to the capability though by not only allowing you to look up the numbers but also allowing you to either call them back or add them to your contacts all from one screen. Light in weight, low memory consumption and quite a useful application available for all devices 4.5 and up and it sells for for only $1 in the CrackBerry App Store.